[Python-Dev] PEP 443 - Single-dispatch generic functions (original) (raw)

Antoine Pitrou solipsis at pitrou.net
Thu May 23 08:04:03 CEST 2013

On Thu, 23 May 2013 12:12:26 +1000 Nick Coghlan <ncoghlan at gmail.com> wrote:

On Thu, May 23, 2013 at 10:14 AM, Glenn Linderman <v+python at g.nevcal.com> wrote: > Yet about half of the operator overloads would be incomplete if there were > not corresponding r* methods (radd, rsub, etc.) because the > second parameter is as key to the dispatch as the first. > > While unary operators, and one argument functions would be fully covered by > single dispatch, it is clear that single dispatch doesn't cover a large > collection of useful cases for operator overloading.

The binary operators can be more accurately said to use a complicated single-dispatch dance rather than supporting native dual-dispatch.

Not one based on the type of a single argument, though. I guess you can also reduce every function of several arguments to a function accepting a single tuple of several items, but that doesn't sound very interesting.

Regards

Antoine.

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